Question
Elyse and Vincent have a bicycle race. Elyse cycles at a speed of 18 km/h. Vincent cycles at a speed of 21 km/h. If Vincent lets Elyse start 30 min before him, how long will Vincent take to catch up with Elyse?
3 m

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Elyse and Vincent have a bicycle race. Elyse cycles at a speed of 18 km/h. Vincent cycles at a speed of 21 km/h. If Vincent lets Elyse start 30 min before him, how long will Vincent take to catch up with Elyse?